package com.emath.shared;

import android.graphics.Matrix;
import android.graphics.PointF;
import android.graphics.RectF;
import android.util.FloatMath;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;

public class Touch implements OnTouchListener {
	 // These matrices will be used to move and zoom image
	 Matrix matrix = new Matrix();
	 Matrix savedMatrix = new Matrix();

	 // We can be in one of these 3 states
	 static final int NONE = 0;
	 static final int DRAG = 1;
	 static final int ZOOM = 2;
	 int mode = NONE;

	 // Remember some things for zooming
	 PointF start = new PointF();
	 PointF mid = new PointF();
	 float oldDist = 1f;

	 
	 @Override
	 public boolean onTouch(View v, MotionEvent event) {
	  ImageView view = (ImageView) v;
	  // Dump touch event to log
	  dumpEvent(event);

	  // Handle touch events here...
	  switch (event.getAction() & MotionEvent.ACTION_MASK) {
	  case MotionEvent.ACTION_DOWN:
		  Matrix m = view.getImageMatrix();
		  RectF drawableRect = new RectF(0, 0, 300, 300);
		  RectF viewRect = new RectF(0, 0, view.getWidth(), view.getHeight());
		  m.setRectToRect(drawableRect, viewRect, Matrix.ScaleToFit.CENTER);
		  view.setImageMatrix(m);
		  
	   // indicate event was handled
	 }
	 return true;
	 }

	 /** Show an event in the LogCat view, for debugging */
	 private void dumpEvent(MotionEvent event) {
	  String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE",
	    "POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" };
	  StringBuilder sb = new StringBuilder();
	  int action = event.getAction();
	  int actionCode = action & MotionEvent.ACTION_MASK;
	  sb.append("event ACTION_").append(names[actionCode]);
	  if (actionCode == MotionEvent.ACTION_POINTER_DOWN
	    || actionCode == MotionEvent.ACTION_POINTER_UP) {
	   sb.append("(pid ").append(
	     action >> MotionEvent.ACTION_POINTER_ID_SHIFT);
	   sb.append(")");
	  }
	  sb.append("[");
	  for (int i = 0; i < event.getPointerCount(); i++) {
	   sb.append("#").append(i);
	   sb.append("(pid ").append(event.getPointerId(i));
	   sb.append(")=").append((int) event.getX(i));
	   sb.append(",").append((int) event.getY(i));
	   if (i + 1 < event.getPointerCount())
	    sb.append(";");
	  }
	  sb.append("]");
	 }

	 /** Determine the space between the first two fingers */
	 private float spacing(MotionEvent event) {
	  float x = event.getX(0) - event.getX(1);
	  float y = event.getY(0) - event.getY(1);
	  return FloatMath.sqrt(x * x + y * y);
	 }

	 /** Calculate the mid point of the first two fingers */
	 private void midPoint(PointF point, MotionEvent event) {
	  float x = event.getX(0) + event.getX(1);
	  float y = event.getY(0) + event.getY(1);
	  point.set(x / 2, y / 2);
	 }
}
